Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value to/2, (b) find the critical value Za /2, or (c) state that neither the normal distribution nor the t 40 distribution applies 30 Frequency The confidence level is 90%, o is not known, and the histogram of 60 player salaries (in thousands of 20- dollars) of football players on a team is as shown. 10- 4000 8000 12000 16000 20000 Salary (thousands of dollars) Select the correct choice below and, if necessary, fill in the answer box to complete your choice OA. ta/2= (Round to two decimal places as needed.) O B. Za/2= (Round to two decimal places as needed.) O C. Neither the normal distribution nor the t distribution applies